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Home Java Javagetting Started How to use java split method?

How to use java split method?

Nov 02, 2020 pm 04:09 PM
java split

Java中split主要用于分隔字符串,可以根據(jù)匹配給定的正則表達式來拆分字符串;語法格式“String.split(String regex, int limit)”,參數(shù)regex指定正則表達式分隔符,limit指定分割的份數(shù)。

How to use java split method?

相關(guān)推薦:《Java視頻教程

split 方法

將一個字符串分割為子字符串,然后將結(jié)果作為字符串?dāng)?shù)組返回。

stringObj.split([regex,[limit]])
  • stringObj:必選項。要被分解的 String 對象或文字。該對象不會被 split 方法修改。

  • regex:可選項。字符串或 正則表達式 對象,它標(biāo)識了分隔字符串時使用的是一個還是多個字符。如果忽略該選項,返回包含整個字符串的單一元素數(shù)組。

  • limit:可選項。該值用來限制返回數(shù)組中的元素個數(shù)。

說明:

split 方法的結(jié)果是一個字符串?dāng)?shù)組,在 stingObj 中每個出現(xiàn) separator 的位置都要進行分解。separator 不作為任何數(shù)組元素的部分返回。

舉例:

public class SplitDemo {

     public static String[] ss = new String[20];

     public SplitDemo() {

         String s = "The rain in Spain falls mainly in the plain.";
         // 在每個空格字符處進行分解。
         ss = s.split(" ");
     }

     public static void main(String[] args) {

         SplitDemo demo = new SplitDemo();
         for (int i = 0; i < ss.length; i++)
             System.out.println(ss[i]);
     }

}

程序結(jié)果:

The
rain
in
Spain
falls
mainly
in
the
plain.

public string[] split(string regex)

這里的參數(shù)的名稱是 regex ,也就是 regular expression (正則表達式)。這個參數(shù)并不是一個簡單的分割用的字符,而是一個正則表達式

public string[] split(string regex, int limit) {
return pattern.compile(regex).split(this, limit);
}

split 的實現(xiàn)直接調(diào)用的 matcher 類的 split 的方法。讀者已經(jīng)知道,“ . ”在正則表達式中有特殊的含義,因此我們使用的時候必須進行轉(zhuǎn)義。

只要將

String[] names = value.split(".");

改為

String[] names = value.split("//.");

就可以了。

在java.lang包中有String.split()方法,返回是一個數(shù)組

特殊情況有 * ^ : | . \

一、單個符號作為分隔符

  • String address="上海\上海市|閔行區(qū)\吳中路";
String[] splitAddress=address.split("\\"); 
System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
  • String address="上海|上海市|閔行區(qū)|吳中路";
String[] splitAddress=address.split("\\|"); //如果以豎線為分隔符,則split的時候需要加上兩個斜杠【\\】進行轉(zhuǎn)義
System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
  • String address="上海*上海市*閔行區(qū)*吳中路";
 String[] splitAddress=address.split("\\*");
System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
  • String address="上海:上海市:閔行區(qū):吳中路";
String[] splitAddress=address.split("\\:");
System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
  • String address="上海.上海市.閔行區(qū).吳中路";
 String[] splitAddress=address.split("\\.");
System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
  • String address="上海^上海市^閔行區(qū)^吳中路";
String[] splitAddress=address.split("\\^");
System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
  • String address="上海@上海市@閔行區(qū)@吳中路";
String[] splitAddress=address.split("@");
System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
  • String address="上海,上海市,閔行區(qū),吳中路";
String[] splitAddress=address.split(",");
System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);

二、多個符號作為分隔符

String address="上海^上海市@閔行區(qū)#吳中路";

String[] splitAddress=address.split("\\^|@|#");
System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);

例:

 String address = new String("192.168.13.240");
        String[] str = address.split("\\.");
        for(String s : str){
            System.out.println(s);
        }

輸出格式:

192
168
13
240

總結(jié):1)split表達式,其實就是一個正則表達式。* ?^ | 等符號在正則表達式中屬于一種有特殊含義的字符,如果使用此種字符作為分隔符,必須使用轉(zhuǎn)義符即\\加以轉(zhuǎn)義。

??????????(2)如果使用多個分隔符則需要借助 | 符號,如二所示,但需要轉(zhuǎn)義符的仍然要加上分隔符進行處理

更多編程相關(guān)知識,請訪問:編程教學(xué)??!

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